# List of auxiliary Interstate Highways

(Redirected from Auxiliary Interstate Highway)

Dwight D. Eisenhower National System of Interstate and Defense Highways
Highway shield for Interstate 295
Interstate Highways in the 48 contiguous states
System information
FormedJune 29, 1956[1]
Highway names
InterstatesInterstate X (I-X)

The auxiliary Interstate Highways (also called three-digit Interstate Highways) are a supplemental subset of the freeways within the Interstate Highway System of the United States. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway Standards (with rare exceptions), they receive the same percentage of federal funding (90%), and they comply with other federal standards.

Auxiliary routes are generally classified as spur routes (which connect to the parent route at one end), bypasses (which connect to the parent route at both ends), or beltways, which form a complete circle intersecting the parent route at two locations. There are some routes which connect to the parent route at one end, but connect to another route at the other end; some states treat these as spurs while others treat them as bypasses.

These shorter auxiliary routes branch off of main routes and are numbered based on the number of the parent route, such that all I-x95 routes are supplemental routes for I-95. While some exceptions do exist, generally spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and beltways are numbered with an even hundreds digit (such as I-695). Because longer interstates may have many such supplemental routes, the numbers may repeat from state to state along their route, but they will not repeat within a state.

## Terminology and guidelines

Routes that begin with an even number generally connect to the main highway in two locations, while odd numbers only connect in one location.

The basic tenets of the auxiliary Interstates are divided into three branches: spur, loop, and bypass routes. Each one signifies a different characteristic of the auxiliary route.

The first digit of the three digits usually determines whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-515 contains an odd number in the first digit (5), and this indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 shows that it is a supplement to I-15.

Numerous exceptions to the standard numbering guidelines exist in many places. This can be for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in the system. In other cases, it may not be possible to use the proper number because the limited set of available numbers has been exhausted, causing a "non-standard" number to be used.

### Spur route

A spur route's number usually has an odd number for its first digit.[2] It is usually one of the following:

• It may serve another section of a city or metropolitan area not served by the main freeway (most often the central business district), terminating at a regular city street/avenue or at a substandard freeway, such as I-180 in Lincoln, Nebraska.
• It may represent the first portion of a contemplated extended freeway, one that downgrades to below Interstate standards with plans to upgrade it later on. An example is I-540 in Arkansas.
• It may connect two unrelated Interstate highways—such as I-390 in New York State and I-355 in Illinois do.
• Note that states differ on their interpretation of the numbering convention in this case. In the I-390 example above, the route has both ends at Interstates, but not at the same Interstate on both ends, and is assigned an odd first digit. Another example is I-275 in Tennessee: it is a connector between I-40 and I-75 (a similar case of having both ends at Interstates but not at the same Interstate) and is assigned an even first digit.

Examples include:

Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via the three-digit highways they do intersect with.

Examples include:

### Bypass

A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit.[2]

Examples include:

In the case of an auxiliary Interstate highway which has both ends at Interstates but not the same Interstate, some states treat these as bypasses while others treat these as spurs — see Spur route above.

### Beltway

A beltway (also known as a loop route) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways, beltways do not have termini; however, they have a place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit.[2]

Some examples of beltways include:

## Auxiliary Interstates

Note: the table sorts the route numbers by parent highway.
Number Length (mi)[3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
H-201 4.10 6.60 H-1 in Halawa, HI H-1 in Honolulu, HI 2004[4] current
I-105 17.32 27.87 SR 1 in El Segundo, CA I-605 in Norwalk, CA 1963 current Replaced segments of SR 42
I-205 12.97 20.87 I-580 near Tracy, CA I-5 near Tracy, CA 1970 current
I-305 6.00 9.66 I-80 in West Sacramento, CA I-80 Bus/US 50/SR 99 in Sacramento, CA 1981 current Unsigned
I-405 72.15 116.11 I-5 in Irvine, CA I-5 in Mission Hills, CA 1964 current
I-505 32.98 53.08 I-80 in Vacaville, CA I-5 in Dunnigan, CA 1977 current Originally part of I-5W
I-605 27.40 44.10 I-405 in Seal Beach, CA I-210 in Irwindale, CA 1964 current
I-805 28.02 45.09 I-5 in San Ysidro, CA I-5 in Sorrento Valley, CA 1959 current
I-905 8.96[5] 14.42 I-5 in San Ysidro, CA Fed. 2 at the United States-Mexico border in Otay Mesa, CA proposed Currently SR 905, proposed to be signed as an Interstate
I-105 3.49 5.62 OR 99 in Eugene, OR I-5 in Springfield, OR 2011 current
I-405 3.53 5.68 I-5 in Portland, OR I-5 in Portland, OR 1969 current
I-205 36.64 58.97 I-5 in Tualatin, OR I-5 in Salmon Creek, WA 1975 current
I-405 30.30 48.76 I-5/SR 518 in Tukwila, WA I-5/SR 525 in Lynnwood, WA 1964 current
I-605 proposed Proposed to bypass Seattle, WA
I-705 1.50 2.41 I-5/SR 7 in Tacoma, WA 1990 current Schuster Parkway in Tacoma
I-210 I-10 in Mobile, AL (original southern terminus) I-65 in Prichard, AL Currently I-165, the route number was decommissioned because it had no connection to I-10
I-410 I-10/I-17 in Phoenix, AZ I-10 in Phoenix, AZ Now part of I-10 in Phoenix, AZ
I-510 I-10/SR 51 in Phoenix, AZ SR 101 in Phoenix, AZ Currently designated as SR 51 (Piestewa Freeway)
I-710 I-10 in Tucson, AZ North Campbell Avenue/East 6th Street in Tucson, AZ Mostly never built freeway that was to connect to University of Arizona campus from I-10
I-110 20.43 32.88 SR 47 in San Pedro, CA I-10/SR 110 in Los Angeles, CA 1978 current Originally part of US 66, then signed as SR 11
I-210 48.72 78.41 I-5 in Sylmar, CA SR 57/SR 210 in Glendora, CA 1964 current Segment from SR 57 east to I-10 is still signed as SR 210, formerly SR 30 prior to 2007.
I-710 19.66 31.64 Terminal Island in Long Beach, CA Valley Boulevard in Alhambra, CA 1983 current Originally signed as SR 7
I-110 6.94 11.17 US 98 Bus. near Pensacola, FL I-10 near Pensacola, FL 1969 current
I-110 8.89 14.31 I-10 in Baton Rouge, LA US 61 in Baton Rouge, LA 1964 current
I-210 12.40 19.96 I-10 west of Lake Charles, LA I-10 east of Lake Charles, LA 1964 current
I-310 11.25 18.11 US 90/LA 3127 in Boutte, LA I-10 west of Kenner, LA 1983 current
I-310 2.70 4.35 US 90 Bus. in New Orleans, LA I-10 in New Orleans, LA 1964 1969 Cancelled Vieux Carré Riverfront Expressway
I-410 1.90 3.06 LA 67 in Baton Rouge, LA I-10 in Baton Rouge, LA 1961 1964 Renumbered as I-110
I-410 I-10 west of New Orleans, LA I-10 in New Orleans, LA 1969 1977 Cancelled southern bypass of New Orleans
I-510 3.04 4.89 LA 47 in New Orleans, LA I-10/LA 47 in New Orleans, LA 1992 current
I-610 4.52 7.27 I-10 at MetairieNew Orleans, LA, line I-10 in New Orleans, LA 1965 current
I-910 9.70 15.61 US 90 Bus. in Marrero, LA I-10/US 90 Bus. in New Orleans, LA 1999 current Signed as part of US 90 Bus. and Future I-49
I-110 4.10 6.60 US 90 in Biloxi, MS I-10 in D'Iberville, MS 1988 current
I-310 US 90 near the Port of Gulfport, MS I-10 in Gulfport, MS proposed Future spur into Gulfport, MS
I-110 0.92 1.48 Av Abraham Lincoln at the United States-Mexico border in El Paso, TX I-10 in El Paso, TX 1967 current Shortest signed Interstate in the country
I-410 49.49 79.65 Beltway around San Antonio, TX 1959 current
I-610 37.97 61.11 Beltway around Houston, TX 1975 current
I-215 54.50 87.71 I-15 in Murrieta, CA I-15 in Devore, CA 1982 current Originally signed as I-15E, then SR 215
I-115 1.19 1.92 I-15/I-90 in Butte, MT Iron Street in Butte, MT 1971 current
I-315 0.83 1.34 I-15 in Great Falls, MT I-15 Bus/US 89 in Great Falls, MT 1960 current Unsigned
I‑215 11.10 17.86 I-15/Clark County Route 215 near Paradise, NV I-515/US 93/SR 564 in Henderson, NV 1996 current
I‑515 20.54 33.06 US 93/US 95 in Henderson, NV I-15/US 93/US 95 in Las Vegas, NV 1976 current Not signed until 1994, this route is entirely concurrent with US 93/US 95
I-215 29.02 46.70 I-80 in Salt Lake City, UT I-15 in North Salt Lake, UT 1963 current
I-415 2.39 3.85 I-80 in Salt Lake City, UT 4430 S in Holladay, Utah 1965 1969 Designation was scrapped to provide a single route number 215 for the entire route.
I-516 6.49 10.44 SR 21/SR 204 in Savannah, GA SR 21 in Garden City, GA 1985 current
I-420 5.40 8.69 I-285 in College Park, GA I-20 in Atlanta, GA 1983 1986 Never built, was planned to bypass Atlanta, GA
I-520 16.14 25.97 I-20 in Augusta, GA I-20 in North Augusta, SC 1980 current
I-220 17.62 28.36 I-20/LA 3132 in Shreveport, LA I-20 in Bossier City, LA 1979 current
I-420 10.20 16.42 I-20 in West Monroe, LA I-20 in Monroe, LA 1957 1964 Cancelled bypass of Monroe
I-220 12.01 19.33 I-20 in Jackson, MS I-55 in Ridgeland, MS 1981 current
I-820 35.17 56.60 I-20 in Fort Worth, TX I-20/US 287 in Fort Worth, TX 1959 current
I-222 I-22 near Birmingham, AL I-422 near Birmingham, AL proposed
I-422 I-20/I-59/I-459/US 11 in Bessemer, AL I-59 in Argo, AL proposed If built, it will have no direct connections to I-22.
I-124 1.97 3.17 I-24 in Chattanooga, TN US 27 in Chattanooga, TN 1960 current Unsigned
I-225 12.00 19.31 I-25 in Denver, CO I-70 in Aurora, CO 1976 current
I-126 3.68 5.92 I-26 in Columbia, SC US 21/US 76/US 176/US 321 in Columbia, SC 1961 current
I-326 5.24 8.43 I-26 in Cayce, SC SC 48 in Columbia, SC 1976 1995 Now part of I-77, formerly unsigned
I-526 19.26 31.00 US 17 in Charleston, SC I-526 Bus./US 17 in Mount Pleasant, SC 1989 current
I-129 3.48 5.60 US 20/US 75/US 77 in South Sioux City, NE I-29/US 20/US 75 in Sioux City, IA 1976 current
I-229 14.97 24.09 I-29 in St. Joseph, MO I-29/US 59/US 71 in St. Joseph, MO 1986 current
I-229 11.33 18.23 I-29 in Sioux Falls, SD I-90 near Sioux Falls, SD 1966 current
I-130 5 8 I-30/I-49 in Texarkana, AR US 59/US 71 near Texarkana, AR 2000 2014 Now part of I-49
I-430 12.93 20.81 I-30/US 67 in Little Rock, AR I-40/US 65 in Little Rock, AR 1980 current
I-530 46.65 75.08 US 65 in Pine Bluff, AR I-30/I-440 in Little Rock, AR 1999 current
I-630 7.40 11.91 I-430 near Little Rock, AR I-30 in Little Rock, AR 1985 current
I-235 13.78 22.18 I-35/I-80 in West Des Moines, IA I-35/I-80 near Des Moines, IA 1961 current
I-135 95.74 154.08 Kansas Turnpike/I-35 in Wichita, KS I-70/US 81 in Salina, KS 1976 current
I-235 16.52 26.59 I-135/US 81 in Wichita, KS I-135/US 81/K-15/K-254 in Wichita, KS 1965 current
I-335 50.13 80.68 I-35/Kansas Turnpike/US 50 in Emporia, KS I-470/Kansas Turnpike in Topeka, KS 1987 current
I-435 80.81 130.05 Beltway around Kansas City, KS, and Kansas City, MO 1965 current
I-635 8.90 14.32 I-35 in Overland Park, KS I-29/US 71 in Kansas City, MO 1968 current
I-335 2.74[6] 4.41 I-94 in Minneapolis, MN I-35W in Minneapolis, MN 1964 1978 Cancelled
I-535 2.78 4.47 I-35/US 53 in Duluth, MN US 53/WIS 35 in Superior, WI 1971 current
I-235 5.36 8.63 I-35/I-40 in Oklahoma City, OK I-44 in Oklahoma City, OK 1989 current
I-635 37.00 59.55 SH 121 in Grapevine, TX I-20 in Balch Springs, TX 1959 current
I-238 2.23 3.59 I-880 in San Leandro, CA I-580/SR 238 in Castro Valley, CA 1983 current Considered an auxiliary route of I-80 in California; there is no I-38
I-440 9.96 16.03 I-30/I-530 near Little Rock, AR I-40/AR 440 near Little Rock, AR 2003 current
I-540 15.87 25.54 US 271/AR 253 near Fort Smith, AR I-40 in Van Buren, AR 1965 current
I-140 6.79 10.93 US 17 near Winnabow, NC I-40/US 17 in Wilmington, NC 2008 current
I-240 9.54 15.35 I-26/I-40/US 74 near Asheville, NC I-40/US 74A in Asheville, NC 1980 current
I-440 16.77 26.99 I-40/US 1/US 64 near Cary, NC I-40 near Raleigh, NC 1991 current
I-540 25.84 41.59 I-40 near Durham, NC I-87/US 64/US 264 near Knightdale, NC 1997 current
I-840 5.77 9.29 I-40/I-73/US 421 in Greensboro, NC I-40/I-85/I-785/I-85 Bus. in Greensboro, NC 2011 current
I-240 16.22 26.10 I-44/US 62 in Oklahoma City, OK I-40/US 270 in Oklahoma City, OK 1965 current
I-440 9.96 16.03 I-40/I-240 near Oklahoma, OK I-35 in Oklahoma City, OK 1975 Now part of I-44
I-140 11.17 17.98 I-40 near Farragut, TN US 129 near Alcoa, TN 1987 current
I-240 19.27 31.01 I-40 in Memphis, TN I-40 in Memphis, TN 1970 current
I-440 7.64 12.30 I-40 in Nashville, TN I-24 in Nashville, TN 1987 current
I-640 7.03 11.31 I-40 in Knoxville, TN I-40 in Knoxville, TN 1982 current
I-840 77.28[7] 124.37 I-40 near Dickson, TN I-40 near Lebanon, TN 2016 current
I-244 15.75 25.35 I-44 in Tulsa, OK I-44 in Tulsa, OK 1970 current
I-444 2.51 4.04 I-244 in Tulsa, OK I-244 in Tulsa, OK 1970 current Unsigned
I-345 1.40 2.25 I-30/I-45 in Dallas, TX US 75 in Dallas, TX 1973 current Unsigned
I-555 49.80 80.15 I-55 in Turrell, AR AR 91 in Jonesboro, AR 2016 current
I-155 32.13 51.71 I-74 in Morton, IL I-55 in Lincoln, IL 1992 current
I-255 30.82 49.60 I-55/I-270 in Mehlville, MO I-270/IL 255 in Pontoon Beach, IL 1986 current
I-355 32.51 52.32 I-80 in New Lenox, IL I-290 in Itasca, IL 1989 current
I-155 15.93 25.64 I-55 near Hayti, MO US 51 at Dyersburg, TN 1980 current
I-255 I-55/I-240 in Memphis, TN I-40 in Memphis, TN Now part of I-55 and I-240
I-359 2.30 3.70 I-20/I-59 in southern Tuscaloosa, AL 15th Street in downtown Tuscaloosa, AL 1983 current
I-459 32.80 52.79 I-20/I-59 in Bessemer, AL I-59 in Trussville, AL 1984 current
I-759 4.50 7.24 I-59 in Attalla, AL US 411/SR 759 in Gadsden, AL 1986 current
I-164 21.39[8] 34.42 US 41/Veterans Memorial Parkway in Evansville, IN I-69 in Evansville, IN 1990 2014 Decommissioned; now part of I-69[9]
I-264 22.93 36.90 I-64 in Louisville, KY I-71 in Louisville, KY 1956 current
I-264 25.07 40.35 I-64/I-664 in Chesapeake, VA Parks Ave in Virginia Beach, VA 1960 current
I-464 4.71 7.58 I-64 in Chesapeake, VA I-264 in Norfolk, VA 1960 current
I-564 3.03 4.88 SR 337 I-64 in Norfolk, VA 1970 current
I-664 20.21 32.52 I-64/I-264 in Norfolk, VA I-64 in Hampton, VA 1971 current
I-165 4.90 7.89 US 43 in Mobile, AL I-65 in Mobile, AL 1994 current
I-565 21.40 34.44 I-65/US 72/SR 20 in Decatur, AL US 72 in Huntsville, AL 1991 current
I-165 2.70 4.35 I-65/I-70 in Indianapolis, IN 38th Street in Indianapolis, IN 1978 1981 Was to be a spur linking from I-65/70 to 38th Street entirely with Indianapolis
I-265 6.73 10.83 I-64 in New Albany, IN SR 62/SR 265 in Clarksville, IN 1977 current Connected with I-265 in Kentucky on December 18, 2016, with the completion of the East End Bridge
I-465 52.79 84.96 Beltway around Indianapolis 1970 current
I-865 4.72 7.60 I-65 near Indianapolis, IN I-465 near Indianapolis 2002 current
I-265 24.48 39.40 I-65/KY 841 in Heritage Creek, KY I-71/KY 841 in Prospect, KY 1977 current Connected with I-265 in Indiana on December 18, 2016, with the completion of the East End Bridge
I-265 2 3 I-40 in Nashville, TN I-65 in Nashville, TN 2000 Now part of I-65
I-165 72.18 116.16 US 60/US 231 in Owensboro, KY I-65 in Bowling Green, KY proposed Proposed for designation along William H. Natcher Parkway once updated to Interstate standards
I‑266 1.79 2.88 1972 Proposed loop route of I-66 between the District, and Arlington County; if built, would have been the only auxiliary route of I-66; cancelled in the face of community opposition during Washington's freeway revolts
I-169 34.27 55.15 I-24 near Hopkinsville, KY I-69 in Nortonville, KY 2017 current New designation along the former Pennyrile Parkway
I-369 23.441 37.725 I-69/Pennyrile Parkway in Henderson, KY US 60 in Owensboro, KY proposed Proposed for designation along Audubon Parkway once upgraded to Interstate standards
I-269 45.19 72.73 I-55/I-69 in Hernando, MS I-69 in Millington, TN 2015 current Construction completed in October 2018; co-signed with SR 304 in MS and SR 385 in TN
I-169 18.7 30.1 US 45W/US 51 in Union City, TN US 45E/SR 43 in Martin, TN proposed Proposed for designation along SR 22 once upgraded to Interstate standards
I-469 30.83 49.62 I-69 in Fort Wayne, IN I-69 in Fort Wayne, IN 1995 current
I-169 1.50 2.41 I-69E/US 77/US 83 in Olmito, TX Port of Brownsville main entrance in Brownsville, TX 2015 current Currently under construction; partially open and co-signed with SH 550
I-369 3.50 5.63 Tenaha, TX Texarkana, TX 2013 current Partially completed in 2013. Eventually, it will surpass I-476 as the longest Auxiliary Interstate in the country.
I-270 5.31 8.55 I-25/US 36 at Welby, CO I-70/US 36 at Denver, CO 1965 current
I-470 Beltway around Denver Metro, CO Now part of SH 470
I-270 50.59 81.42 I-55/Interstate 255 I-55/I-70 near Troy, IL 1956 current
I-470 13.72 22.08 I-70 in Topeka, KS I-70/Kansas Turnpike in Topeka, KS 1960 current
I-670 2.81 4.52 I-70 in Kansas City, KS I-70 in Kansas City, MO 1968 current
I-170 2.30 3.70 I-70 in Baltimore, MD US 40 in Baltimore, MD 1969 1983 Cancelled
I-270 32.60 52.46 I-70 near Frederick, MD I-495 north of Bethesda, MD 1975 current

I-270 Spur
2.10[10] 3.38 I-270 east of Potomac, MD Interstate 495I-495 northwest of Bethesda, MD 1975 current Serves as an alternate connector for Virginia travelers
I-370 2.54 4.09 I-270 in Gaithersburg, MD MD 200 in Derwood, MD 1988 current
I-170 11.17 17.98 I-64/US 40 in Richmond Heights, MO I-270 in Hazelwood, MO 1956 current
I-470 16.72 26.91 I-49/I-435 in Kansas City, MO I-70 in Independence, MO 1983 current
I-270 54.97 88.47 Beltway around Columbus, OH 1964 current
I-470 6.69 10.77 I-70 near Blaine, OH I-70 in Elm Grove, WV 1976 current
I-670 9.37 15.08 I-70 in Columbus, OH I-270 near John Glenn Columbus International Airport 2003 current
I-271 46.06 74.13 I-71 near Medina, OH I-90 in Willoughby Hills, OH 1964 current
I-471 5.75 9.25 I-275 near Newport, KY I-71 in Cincinnati, OH 1981 current
I-172 19.69 31.69 I-72 in Quincy, IL US 24 in Quincy, IL 1995 current
I-474 14.88 23.95 I-74 in Peoria, IL I-74 in Morton, IL 1973 current
I-274 proposed Proposed route in Winston-Salem, NC
I-175 1.44 2.32 I-275 in St. Petersburg, FL SR 687 in St. Petersburg, FL 1980 current
I-275 60.64 97.59 I-75 near Memphis, FL I-75 in Wesley Chapel, FL 1973 current
I-375 1.34 2.16 I-275 in St. Petersburg, FL US 92 in St. Petersburg, FL 1979 current
I-175 US 82 in Albany, GA I-75 in Cordele, GA Now part of SR 300
I-475 15.83 25.48 I-75 in Macon, GA I-75 in Macon, GA 1965 current
I-575 30.97 49.84 I-75 in Kennesaw, GA SR 5 west of Nelson, GA 1985 current
I-675 11.04 17.77 I-75 in Stockbridge, GA I-285 southeast of Atlanta, GA 1987 current
I-275 83.71 134.72 Beltway around Cincinnati, OH 1962 current Runs through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
I-275 35.01[11][a] 56.34 I-75 near Monroe, MI I-96, I-696 and M-5 in Farmington Hills, MI 1977 current
I-375 1.06 1.71 BS I-375 in Detroit, MI I-75 in Detroit, MI 1964 current
I-475 16.99 27.34 I-75 near Grand Blanc, MI I-75/US 23 near Mount Morris, MI 1973 current Runs east and north of Flint, MI
I-675 7.72 12.42 I-75/US 23 near Saginaw, MI I-75/US 23 near Zilwaukee, MI 1971 current
I-475 20.37 32.78 I-75 in Perrysburg, OH I-75 in Toledo, OH 1964 current
I-675 26.53 42.70 I-75 near Miamisburg, OH I-70 near Medway, OH 1987 current
I-175 I-75 in Chattanooga, TN I-75 in Lexington, KY
I-275 2.98 4.80 I-40 in Knoxville, TN I-75/I-640 in Knoxville, TN 1982 current
I-475 I-40/I-75 near Knoxville, TN I-75 near Knoxville, TN Cancelled
I-676 6.90 11.10 I-76/US 30 in Philadelphia, PA I-76 in Camden, NJ 1991 current
I-176 11.33 18.23 I-76/Pennsylvania Turnpike in Morgantown, PA US 422 near Reading, PA 1964 current
I-276 29.78 47.93 I-76 in King of Prussia, PA I-95/I-295 in Bristol Township, PA 1964 current Truncated in 2018, replaced by I-95
I-376 78.70 126.66 I-80 near Hermitage, PA I-76/US 22 in Monroeville, PA 1972 current
I-476 129.61 208.59 I-95 near Chester, PA I-81/US 6/US 11 near Clarks Summit, PA 1992 current
I-576 proposed Proposed Southern Beltway route from Pittsburgh International Airport to I-376
I-876 1971 1972 Short lived renumbering of I-479, now I-579
I-277 4.46 7.18 Beltway around uptown Charlotte, NC 1981 current
I-277 4.14 6.66 I-76 in Akron, OH I-77 in Akron, OH 1970 current
I-178 1971 Cancelled
I-378 1968 1971 Replaced by PA Route 378
I-278 35.62 57.32 US 1/9 in Linden, NJ Bruckner Interchange in Bronx, NY 1961 current Does not intersect with parent route I-78
I-478 2.14 3.44 I-278 in Brooklyn, NY NY 9A in Manhattan, NY 1971 current Unsigned; does not intersect with parent route I-78
I-678 14.33 23.06 John F. Kennedy International Airport in Queens, NY Bruckner Interchange in Bronx, NY 1965 current Does not intersect with parent route I-78
I-878 0.70 1.13 I-678 in Queens, NY, near John F. Kennedy International Airport JFK Expressway in Queens, NY, near JFK Airport 1970 current Unsigned; does not intersect with parent route I-78
I-179 McKean Township, PA Erie, PA 1958 1968 Replaced by its parent route, I-79
I-279 13.32 21.44 I-376/US 22/US 30 in Pittsburgh, PA I-79 in Franklin Park, PA 1972 current
I-479 1966 1971 Early number for I-579
I-579 1.57 2.53 PA 885 in Pittsburgh, PA I-279/PA 28 in Pittsburgh 1962 current
I-180 US 101 in San Rafael, CA I-80 near Berkeley, CA 1978 1991 Temporary designation of what was formerly part of SR 17, now part of I-580
I-280 57.22 92.09 I-680/US 101 in San Jose, CA King Street in San Francisco, CA 1964 current
I-380 1.671 2.689 I-280 in San Bruno, CA US 101 in San Bruno, CA 1964 current
I-480 I-80 in San Francisco, CA Sansome Street in San Francisco, CA 1957 1968 Was to be the Embarcadero Freeway; downgraded to a state highway in 1968 and fully decommissioned in 1991
I-580 75.63 121.71 US 101 in San Rafael, CA I-5 near Westley, CA 1964 current Segments were originally part of I-5W
I-680 70.52 113.49 I-280/US 101 in San Jose, CA I-80 in Cordelia, CA 1955 current Originally SR 21
I-780 6.50 10.46 I-80 in Vallejo, CA I-680 in Benicia, CA 1955 current Originally part of I-680
I-880 47.22 75.99 I-280/SR 17 in San Jose, CA I-80/I-580 in Oakland, CA 1983 current Originally part of SR 17
I-880 I-80 in West Sacramento, CA I-80 in Sacramento, CA 1971 1983 Now part of I-80
I-980 2.03 3.27 I-880 in Oakland, CA I-580/SR 24 in Oakland, CA 1981 current
I‑580 30.09 48.43 US 50 in Carson City, NV I-80 in Reno, NV 2012 current Runs concurrently with US 395
I-180 13.19 21.23 IL 26/IL 71 in Hennepin, IL I-80 near Princeton, IL 1969 current
I-280 26.98 43.42 I-80 near Davenport, IA I-74/I-80 near Colona, IL 1990 current
I-380 73.05 117.56 I-80 near Iowa City, IA US 218 in Waterloo, IA 1985 current Connects Cedar Rapids, IA, with I-80
I-480 4.90 7.89 I-80/US 75 in Omaha, NE I-29/US 6 in Council Bluffs, IA 1966 current
I-680 42.86 68.98 I-80 in Omaha, NE I-80 near Neola, IA 1966 current
I-180 3.18 5.12 US 34 in Lincoln, NE I-80/US 34/US 77 in Lincoln, NE 1965 current
I-280 1958 1965 Now designated as I-680
I-580 1.60 2.57 I-480 in Omaha, NE Lake Street in Omaha, NE 1976 1982 Now part of US 75
I-280 17.85 28.73 I-80 in Parsippany-Troy Hills, NJ I-95/New Jersey Turnpike in Kearny, NJ 1958 current
I-280 12.41 19.97 I-75 in Toledo, OH I-80/I-90/Ohio Turnpike in Lake Township, OH 1959 current
I-380 I-76/I-77 in Akron, OH I-271 in Macedonia, OH proposed
I-480 41.77 67.22 I-80/Ohio Turnpike in North Ridgeville, OH I-80/Ohio Turnpike in Streetsboro, OH 1971 current
I-680 16.43 26.44 I-76/Ohio Turnpike in North Lima, OH I-80/SR 11 near Mineral Ridge, OH 1964 current
I-180 28.85 46.43 US 15/US 220 in Williamsport, PA I-80/PA 147 near Milton, PA 1984 current
I-180 Now part of I-176
I-280 1958 1964 Now part of Pennsylvania Turnpike
I-380 24.76 39.85 I-80 in Tunkhannock Township, PA I-81/I-84/US 6 in Dunmore, PA 1973 current
I-480 Now part of I-476
I-680 1958 1964 Now I-676
I-180 1.09 1.75 I-80 in Cheyenne, WY I-80 Bus./US 30 in Cheyenne, WY 1984 current Not built to Interstate Highway standards
I-481 15.04 24.20 I-81 in Onondaga, NY I-81/NY 481 in North Syracuse, NY 1970 current
I-781 4.30 6.92 I-81 in Pamelia, NY Fort Drum main gate in Le Ray, NY 2012 current
I-381 1.67 2.69 SR 381 in Bristol, VA I-81 in Bristol, VA 1961 current
I-581 6.64 10.69 US 220/SR 24 in Roanoke, VA I-81 near Hollins, VA
I-181 23.85 38.38 US 321/SR 67 in Johnson City, TN US 11W/SR 1 in Kingsport, TN 1985 2007 Now part of I-26
I-182 15.19 24.45 I-82/US 12 near Richland, WA US 12/US 395 in Pasco, WA 1986 current
I-283 2.91 4.68 I-76/Pennsylvania Turnpike near Highspire, PA I-83/US 322/Capital Beltway near Harrisburg, PA 1972 current
I-384 8.20 13.20 I-84/US 6 in East Hartford, CT US 6/US 44 in Bolton, CT 1984 current
I-684 28.47 45.82 I-287 near White Plains, NY NY 22 near Brewster, NY 1974 current Also crosses into Connecticut
I-184 3.62 5.83 I-84 in Boise, ID US 20/US 26 1990 current
I-685 14.00 22.53 I-65 in downtown Montgomery, AL I-85 in Montgomery, AL proposed
I-185 49.30 79.34 US 27/US 280/SR 520 in Columbus, GA I-85 near LaGrange, GA 1979 current
I-285 63.98 102.97 Beltway around Atlanta, GA 1969 current
I-485 5.9 9.5 I-75/I-85 in Atlanta, GA I-85 in Atlanta 1964 1975 Now Freedom Parkway, was planned to relieve traffic along Downtown Connector (I-75/85) through downtown Atlanta
I-985 24.04 38.69 I-85 near Buford, GA SR 369 near Gainesville, GA 1985 current
I-285 22.8 36.7 I-85/I-85 Bus./US 29/US 52/US 70 near Lexington, NC I-40/US 52/US 311/NC 8 in Winston-Salem, NC 2018 current An unconfirmed section of Future I-285 is to continue north of I-40 for 10 miles (16 km) along US 52, through downtown Winston-Salem, to the proposed Winston-Salem Northern Beltway.[14][15]
I-485 66.68 107.31 Beltway around Charlotte, NC 1988 current
I-785 2.21 3.56 I-40/I-85/I-840/I-85 Bus. in Greensboro, NC US 70 in Greensboro, NC 2013 current Future northern terminus at US 29/US 58/US 360/US 58 Bus. in Danville, VA
I-885 proposed
I-185 17.70 28.49 I-385 near Mauldin, SC US 29 in Greenville, SC 1955 current
I-385 42.16 67.85 I-26 near Clinton, SC US 276 in Greenville, SC 1962 current
I-585 2.25 3.62 US 176/US 221/SC 9 in Spartanburg, SC I-85 Bus./US 176 near Spartanburg, SC 1962 current
I-287 98.72 158.87 I-95/New Jersey Turnpike in Edison, NJ I-95 in Rye, NY 1961 current
I-587 1.21 1.95 I-87/New York State Thruway/NY 28 in Kingston, NY NY 28/NY 32 in Kingston, NY 1960 current
I-587 Future I-87 (current US 64) near Zebulon, NC US 264 near Greenville, NC proposed[16]
I-787 10.16 16.35 I-87/New York State Thruway in Albany, NY NY 7 in Green Island, NY 1968 current
I-189 1.49 2.40 US 7 in South Burlington, VT I-89 in South Burlington, VT 1980 current
I-190 3.07 4.94 O'Hare International Airport in Chicago, IL I-90 in Chicago, IL 1978 current
I-290 29.84 48.02 I-90/IL 53 in Rolling Meadows, IL I-90/I-94/Congress Parkway in Chicago, IL 1972 current
I-490 I-294 I-90 proposed Proposed route number for the O'Hare West Bypass[17]
I‑190 19.26 31.00 I-290 in Worcester, MA Route 2 in Leominster, MA 1983 current
I‑290 20.16 32.44 I-395 in Auburn, MA I-495 in Marlborough, MA 1970 current
I-190 28.34 45.61 I-90/New York State Thruway in Cheektowaga, NY Highway 405 at Lewiston, NY 1959 current
I-290 9.80 15.77 I-190 in Tonawanda, NY I-90/New York State Thruway in Williamsville, NY 1964 current
I-390 76.06 122.41 I-86/NY 17 in Avoca, NY I-490 in Gates, NY 1973 current
I-490 37.40 60.19 I-90/New York State Thruway in Bergen, NY I-90/New York State Thruway in Victor, NY 1970 current
I-590 5.31 8.55 I-390 in Brighton, NY I-490/NY 590 in Rochester, NY 1980 current
I-690 14.19 22.84 I-90/New York State Thruway/NY 690 in Van Buren, NY I-481 in East Syracuse, NY 1962 current
I-790 2.41 3.88 I-90/New York State Thruway in Deerfield, NY NY 5A/NY 55 in Utica, NY 1961 current
I-890 9.35 15.05 I-90/New York State Thruway in Rotterdam, NY I-90/New York State Thruway in Guilderland, NY 1962 current
I-990 6.35 10.22 I-290 in Amherst, NY NY 263 near Lockport, NY 1985 current Highest numbered Interstate in the Interstate system
I-490 2.43 3.91 I-71/I-90 in Cleveland, OH East 55th Street in Cleveland, OH 1990 current
I-190 1.72 2.77 I-90 in Rapid City, SD US 16 in Rapid City, SD 1962 current
I-291 6.02 9.69 I-91 in Windsor, CT I-84 in Manchester, CT 1994 current
I-691 8.38 13.49 I-84 at the Southington-Cheshire, CT, town line I-91 in Meriden, CT 1988 current
I‑291 5.44 8.75 I-91 in Springfield, MA I-90/Massachusetts Turnpike in Chicopee, MA 1972 current
I‑391 4.46 7.18 I-91 in Chicopee, MA High Street in Holyoke, MA 1970 current
I‑293 11.18 17.99 I-93/NH 101 in Manchester, NH I-93/Everett Turnpike in Hooksett, NH 2008 current
I‑393 4.60 7.40 I-93 in Concord, NH NH 9 in Pembroke, NH 1979 current
I-294 53.42 85.97 I-80/I-94 in South Holland, IL I-94 in Deerfield, IL 1968 current
I-194 3.38 5.44 I-94 in Battle Creek, MI M-66 in Battle Creek, MI 1961 current
I-394 9.75 15.69 I-494/US 12 in Minnetonka, MN 4th Street in Minneapolis, MN 1991 current
I-494 42.94 69.11 I-94/I-694 in Maple Grove, MN I-94/I-694 in Woodbury, MN 1985 current Western and southern half of the Minneapolis–St. Paul beltway
I-694 22.62 36.40 I-94/I-494 in Maple Grove, MN I-94/I-494 in Woodbury, MN 1970 current Northern and eastern half of the Minneapolis–St. Paul beltway
I-194 1.20 1.93 McKenzie Drive near Bismarck, ND I-94 near Mandan, ND Unsigned
I-794 3.75 6.04 I-43/I-94 in Milwaukee, WI WIS 794 in Milwaukee, WI 1980 current
I-894 4.70 7.56 I-41/I-94 in Milwaukee, WI I-41/I-43/I-94 in Milwaukee, WI 1966 current Completely concurrent with I-41
I-395 54.69 88.02 I-95 in East Lyme, CT I-290 in Auburn, MA 1983 current
I-295 92.30 148.54 I-95/I-495 in New Castle, DE I-95 in Bristol Township, PA 1994 current Extended into Pennsylvania in 2018
I-495 11.47 18.46 I-95/I-295 in Newport, DE I-95 in Lower Chichester Township, PA 1977 current
I-895 1979 1980 Now part of I-95
I‑395 13.39 21.55 I-95/I-495 in Springfield, VA US 50 in Washington, DC 1977 current Original route of I-95 that was proposed to continue through Washington, DC
I‑495 31.41 50.55 Beltway around Washington, DC 1961 current Capital Beltway; runs through Virginia, Maryland and a small sliver of Washington, DC, over the Wilson Bridge
I‑695 2.00 3.22 I-395 in Washington, DC I-295 in Washington, DC[18] 1958 current
I-195 4.42 7.11 I-95/SR 112 in Miami, FL SR 905 in Miami Beach, FL 1961 current
I-295 61.04 98.23 Beltway around Jacksonville, FL 1970 current
I-395 1.29 2.08 I-95 in Miami, FL MacArthur Causeway at Watson Island, Miami, FL 1971 current
I-595 12.86 20.70 I-75/SR 869 in Weston, FL US 1 in Fort Lauderdale, FL 1990 current
I-795 I-95 south of Jacksonville, FL I-295 in Jacksonville, FL proposed Currently under construction; partially open as SR 9B but not yet signed as I-795
I‑195 1.55 2.49 I-95/Maine Turnpike in Saco, ME SR 5 in Saco, ME 1980 current
I‑295 53.11 85.47 I-95/Maine Turnpike in Scarborough, ME I-95/Maine Turnpike in Gardiner, ME 1960 current
I‑395 4.99 8.03 I-95/US 2/SR 100 in Bangor, ME US 1A in Brewer, ME 2008 current
I‑495 3.70 5.95 I-95/Maine Turnpike in Portland, ME I-295/US 1 in Falmouth, ME 2004 current Unsigned
I-195 4.71[19] 7.58 I-95/MD 166 near Catonsville, MD Baltimore-Washington International Airport 1990 current
I-395 1.98 3.19 I-95 in South Baltimore, MD West Pratt Street in Baltimore, MD 1981 current
I-595 19.97 32.14 I-95/I-495/US 50 near Washington, DC US 50/US 301/MD 70 in Annapolis, MD 2011 current Unsigned designation for US 50
I-695 30.57 49.20 Beltway around Baltimore, MD 1958 current
I-795 8.99 14.47 I-695 in Pikesville, MD MD 140 in Reisterstown, MD 1985 current
I-895 11.44 18.41 I-95 near Elkridge, MD I-95 in Baltimore, MD 1979 current
I‑295 8.05 12.96 I-95/I-495 near Forest Heights, MD I-695 in Washington, DC 1964 current
I‑195 44.55 71.70 I-95 in Providence, RI I-495/Route 25 in Wareham, MA 1958 current
I‑295 26.58 42.78 I-95 in Warwick, RI I-95 in Attleboro, MA 1969 current
I‑495 121.56 195.63 I-195/Route 25 in Wareham, MA I-95 in Salisbury, MA 1957 current
I‑695 I-93 in Roxbury, MA I-93 in Charlestown, MA 1955 1971 Cancelled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
I‑895 Route 37/I-295 in Cranston, RI I-95/I-295 in Attleboro, MA 1968 1982 Cancelled; would have supplemented I-295 to create a full Beltway around Providence, RI
I-195 34.17 54.99 I-295 in Hamilton Township, NJ Route 34 in Wall Township, NJ 1968 current
I-895 I-295 in Burlington, NJ I-95 in Bristol, PA 1963 1981 Never built
I-295 7.70 12.39 NY 25/NY 24 in Queens, NY Bruckner Interchange in Bronx, NY 1970 current
I-495 66.38 106.83 Queens Midtown Tunnel in Manhattan, NY CR 58 in Riverhead, NY 1958 current
I-695 1.40 2.25 I-95 in Bronx, NY I-295 in Bronx, NY 1986 current
I-895 1.12 1.80 I-278 in Bronx, NY I-95 in Bronx, NY 1970 2017[20] Currently designated as NY 895
I-295 proposed Planned route around the west side of Fayetteville, NC
I-495 4.10 6.60 I-440/US 64/US 64 Bus. in Raleigh, NC I-540/US 64/US 264 in Knightdale, NC 2013 2017 Now part of I-87
I-795 25.46 40.97 US 70/US 117 in Goldsboro, NC I-95/US 264 in Wilson, NC 2007 current
I-695 I-95 near Philadelphia International Airport I-95 in Philadelphia, PA 1964 1977 Never built
I-195 3.24 5.21 SR 195 in Richmond, VA I-64/I-95 in Richmond, VA 1970 current
I-295 52.56 84.59 I-95 near Petersburg, VA I-64 near Short Pump, VA 1980 current
I-595 I-395 near Arlington, VA US 1 at Ronald Reagan Washington National Airport Now part of US 1
I-895 I-95 near Richmond, VA I-295 near Richmond, VA 1996 2002 Currently designated as SR 895, it was originally planned as a Interstate designation, but did not get approved by AASHTO
I-495 1956 1958 Early number of I-476
I-196 37.07[11] 59.66 US 31 in Norton Shores, MI I-96/US 16 in Grand Rapids, MI 1959 1963 Now the western end of I-96
I-196 80.65 129.79 I-94/US 31 near Benton Harbor, MI I-96/M-37 in Grand Rapids, MI 1963 current
I-296 3.43 5.52 I-196 in Grand Rapids, MI I-96/M-37 in Walker, MI 1962 current Unsigned since 1979
I-496 11.78 18.96 I-69/I-96 near Lansing, MI I-96 and US 127 near Lansing, MI 1970 current
I-696 29.39 47.30 I-96/I-275 & M-5 in Novi, MI I-94 in Roseville, MI 1989 current
I-197 3.44 5.54 Replaced by I-595.
I-297 1987 Withdrawn from request, replaced by MD Route 3.
•       Former
•       Future

## Notes

1. ^ According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96.[3] MDOT and most major map publishers do count the overlap.[11][12][13]

## References

1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.
2. ^ a b c DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved February 3, 2008.
3. ^ a b Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved February 6, 2016.
4. ^ Special Committee on U.S. Route Numbering (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived (PDF) from the original on October 16, 2017.
5. ^ Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved February 5, 2009.
6. ^ Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.
7. ^ Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007.
8. ^ Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Retrieved July 8, 2007.
9. ^ Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF) (Letter). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Retrieved January 9, 2015 – via American Association of State Highway and Transportation Officials.
10. ^ Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
11. ^ a b c Michigan Department of Transportation & Michigan Center for Shared Solutions and Technology Partnerships (2009). MDOT Physical Reference Finder Application (Map). Michigan Department of Transportation. Retrieved February 6, 2016.
12. ^ Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in≈5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN 0-528-93981-5. OCLC 226315010.
13. ^ Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps. Google. Retrieved February 24, 2010.
14. ^ "Ask SAM: Upgrades needed before US 52 can be called I-285". Winston-Salem Journal. January 10, 2014. Retrieved January 10, 2014.
15. ^ "NCDOT: Project U-2826". Retrieved April 17, 2014.
16. ^ "State Seeking Future Interstate Designation for US 264 to Greenville". North Carolina Governor's Office (Press release). Retrieved November 10, 2016.
17. ^ Borggren, Erica J. (6 October 2014). "I 490 Illinois Establish" (PDF). Archived from the original (PDF) on 3 March 2016.
18. ^ DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post.
19. ^ Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
20. ^ Special Committee on U.S. Route Numbering (September 24, 2017). "Special Committee on U.S. Route Numbering" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Retrieved October 21, 2017.